:root { --bg1: #15223a; --bg2: #24407a; --card: #ffffff; --text: #1a2230; --muted: #5a6678; --border: #d3dae5; --accent: #2459d8; --danger: #cf3a3a; --danger-soft: #fdeaea; }
@media (prefers-color-scheme: dark) {
  :root { --card: #19212c; --text: #e6eaf0; --muted: #a6b1c2; --border: #2c3747; --accent: #6d98ff; --danger: #ff7575; --danger-soft: #3f1f22; }
}
* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body { display: grid; place-items: center; padding: 20px; font: 14px/1.45 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif; color: var(--text); background: linear-gradient(135deg, var(--bg1), var(--bg2)); }
.card { width: min(360px, 100%); padding: 26px; border-radius: 14px; background: var(--card); box-shadow: 0 12px 40px rgba(0, 0, 0, .35); }
h1 { margin: 0 0 16px; font-size: 20px; }
form > * + * { margin-top: 12px; }
label { display: block; }
label span { display: block; margin-bottom: 4px; font-size: 12.5px; font-weight: 600; color: var(--muted); }
input { width: 100%; padding: 8px 10px; min-height: 36px; border-radius: 7px; border: 1px solid var(--border); background: transparent; color: inherit; font: inherit; }
input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 20%, transparent); }
button { width: 100%; padding: 9px; border: 0; border-radius: 7px; background: var(--accent); color: #fff; font: inherit; font-weight: 600; cursor: pointer; }
button:disabled { opacity: .6; cursor: default; }
.error { margin: 0; padding: 9px 11px; border-radius: 7px; background: var(--danger-soft); color: var(--danger); font-size: 13px; }